Adjustable headrest mechanism and chair having same
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Solution Overview
Problem
Conventional chairs lack adjustable headrests, leading to discomfort and increased risk of neck and spinal issues due to prolonged sitting, as they do not accommodate user preferences for head support.
Innovation Solution
An adjustable headrest mechanism featuring sliding rails with an arc-shaped guiding groove, driven by a linear push rod motor, allowing the headrest to pivot upward or downward for customizable positioning, ensuring surface contact and reduced pressure on the head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional chairs use fixed headrests, then the structure is simple, but the adaptability to user preferences is poor
Solution Approach 1:
The headrest is designed with dynamic adjustment capabilities through sliding rails and driving rods that allow the headrest to move between multiple positions (up/down, left/right, tilted) to adapt to different user preferences, transforming a static structure into a dynamically adjustable one
Solution Approach 2:
The adjustment mechanism is divided into independent functional modules: sliding rails for vertical movement, driving rods for horizontal adjustment, and tilting mechanisms for angle control. Each module operates independently, allowing complex adjustment functionality while maintaining manageable structural organization
2Adaptability or versatility
If the headrest uses a complex adjustment mechanism, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The sliding rails and driving rods serve multiple functions simultaneously: they provide structural support for the headrest while enabling vertical and horizontal movements. The same components that provide structural integrity also serve as the adjustment mechanism, eliminating the need for separate complex adjustment systems
Solution Approach 2:
The support function and adjustment function are merged into the same structural elements. The sliding rails both support the headrest weight and enable vertical positioning, while the driving rods both connect structural components and enable horizontal adjustment, reducing overall mechanism complexity
3Ease of operation
If the headrest is made adjustable with sliding rails, then the comfort improves, but the stability may be compromised
Solution Approach 1:
The mechanism includes damping elements and friction controls that provide resistance during adjustment and maintain the headrest firmly at selected positions. The sliding rails are designed with appropriate clearance and surface characteristics that allow smooth adjustment during operation but provide stable positioning when adjusted, preventing unintended movement during use
Data Source
AI summary
The adjustable headrest mechanism for a chair comprises a pair of sliding rails; an upper driving rod and a lower driving rod, the upper driving rod being attached to the sliding rails and the lower driving rod being attached to a back frame of the chair; and a headrest actuator pivotally connected between the upper driving rod and the lower driving rod for operably driving the upper driving rod to move between a first position and a second position, thereby driving the sliding rails to pivotally move in an upward direction or a downward direction relative to the lower driving rod. When the upper driving rod is in the first position, the sliding rails is in a complete close state. When the upper driving rod is in the second position, the sliding rails is in a complete open state.